CVE-2026-34502: Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client This issue affec

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-34502 is a high-severity flaw (CVSS 7.5) affecting apr-util. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client This issue affects Apache Portable Runtime Utility: from 1.3.0 through 1.6.3.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-08-06
Last modified	2026-10-23

Publisher (CNA): Apache Software Foundation · Vendor: apache

Am I affected?

Timeline

2026-08-06 15:16 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated Record last modified

apache apr-util UPGRADE

Affected: >= 1.3.0 and <= 1.6.3

Fixed in: newer than 1.6.3

Safe to downgrade to: a release before 1.3.0

1. Check installed version

apt-cache policy apr-util || rpm -q apr-util || apr-util --version

2. UPGRADE to newer than 1.6.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apr-util

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apr-util

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.3.0 (Debian / Ubuntu)

apt-cache madison apr-util sudo apt install apr-util=<VERSION_BEFORE_1.3.0> sudo apt-mark hold apr-util

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list apr-util sudo dnf downgrade apr-util-<VERSION_BEFORE_1.3.0> sudo dnf versionlock add apr-util

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · rubygem-eventmachine · FIXED · 1.2.7-37.fc46 · FEDORA-2026-7194c202a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-7194c202a2

Debian 12 · apr-util · FIXED · 1.6.3-1+deb12u1

sudo apt update && sudo apt install --only-upgrade apr-util dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apr-util)" ge "1.6.3-1+deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · apr-util · FIXED · 1.6.3-3+deb13u1

sudo apt update && sudo apt install --only-upgrade apr-util dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apr-util)" ge "1.6.3-3+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · apr-util · FIXED · apr-util-1.6.3-23.el10_2.1

sudo dnf upgrade --advisory=RHSA-2026:66392 rpm -q apr-util

RHEL 8 · apr-util · FIXED · apr-util-1.6.1-9.el8_10.1

sudo dnf upgrade --advisory=RHSA-2026:69113 rpm -q apr-util

RHEL 9 · apr-util · FIXED · apr-util-1.6.1-23.el9_8.1

sudo dnf upgrade --advisory=RHSA-2026:66341 rpm -q apr-util

RHEL 6 · apr-util · DEFERRED

RHEL 7 · apr-util · NO FIX YET

Alpine 3.21 · apr-util · FIXED · apr-util-1.6.4-r0

apk add --upgrade apr-util apk info -v apr-util

Alpine 3.22 · apr-util · FIXED · apr-util-1.6.4-r0

apk add --upgrade apr-util apk info -v apr-util

Alpine 3.23 · apr-util · FIXED · apr-util-1.6.4-r0

apk add --upgrade apr-util apk info -v apr-util

Alpine 3.24 · apr-util · FIXED · apr-util-1.6.4-r0

apk add --upgrade apr-util apk info -v apr-util

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2115 · source

sudo dnf update --advisory=ALAS2023-2026-2115

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3892 · source

sudo yum update --advisory=ALAS2-2026-3892

Advisories and coverage

Official advisories

Amazon Linux 2 ALAS: ALAS2-2026-3892 (important): apr-util 2026-08-31

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

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References

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